CHE 140 Name__Chesi Spriggs First Hour Exam Potentially useful information 1000 g = 1 kg 1000 mL = 1 L 1 in = 2.54 cm 1 mL = 1 cm3 D = m/v Select the best choice for the following questions. ___e___ 1. A hypothesis is a(n) a. formulation of principles based on facts. b. modification of a theory. c. organized body of knowledge. d. tentative explanation of observations. e. None of the above. __b___ 2. The initial success of the Bohr theory was based
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Combustion of Acetylene (ethyne) Rx: Back Why I don’t do acetlyene explosions in our lab.... Combustion of alkanes A quick review.... • Combustion reactions of alkanes consist only of C and H (hydrocarbon) • require O2(g) as a reactant • produce CO2(g) and H2O(g) and a large amount of energy!! Oxygen can be the limiting reagent which can lead to Incomplete combustion. For complete combustion of a hydrocarbon‚ oxygen must be in excess. If there isn’t sufficient oxygen‚ incomplete combustion occurs
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The presentation should be engaging for the audience (you can direct it to a specific audience or your general community)‚ and should summarize all of the important research and findings. The presentation should include: detailed explanation of how smoke detectors and carbon monoxide detectors work and suggestions for use (number‚ mounting locations‚ etc.) specific explanations of how different fire extinguishers (at least three types) work‚ advantages and disadvantages of each type‚ and effectiveness
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Experiment 7 Gooch filter crucible or fritted-glass funnel Mother liquor- liquid from which a substance precipitates or crystallizes Filtrate- liquid that passes through the filter Slurry- suspension of solid in liquid Calcium ion can be analyzed by precipitation with oxalate in basic solution to form CaC2O4.H2O The precipitate is soluble in acidic solution because the oxalate anion is a weak base CaC2O4.H2O (calcium oxalate monohydrate ; MW = 146 g/mol) Equation: Ca2+(aq) + C2O42-(aq)
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In the Lewis symbol for a fluorine atom‚ there are __________ paired and __________ unpaired electrons. A) 4‚ 2 B) 0‚ 5 C) 2‚ 5 D) 6‚ 1 E) 4‚1 2. Which of the following would have to gain two electrons in order to achieve a noble gas electron configuration? O Sr Na Se Br A) Sr B) Br C) Sr‚ O‚ Se D) Na E) O‚ Se 3. The electron configuration of the S2- ion is __________. A) [Ne]3s23p2 B) [Ne]3s23p6 C) [Kr]3s22p-6 D) [Ar]3s23p2 E) [Ar]3s23p6 4. The ion NO- has __________
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1. Iron (IIII) and copper (II) sulfate solution Fill a small test tube halfway with copper (II) sulfate solution. Add a 2.0 gram iron rod to the solution and observe the reaction. 2 Fe + 3 CuSO4 = 3 Cu + Fe2(SO4)3 The new product is iron (III) sulfate‚ it contains the Fe 3+ ion which is brown. Lead (II) nitrate and potassium iodide solutions Pour about 2.0 mL of lead (II) nitrate into the test tube. Add 5 to 10 drops of potassium iodide solution to the test tube and record your observations
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Stoichiometry • Calculations involving quantities of consumed reactants and formed products based on a BALANCED chemical equation. Mass Molar Mass Mole Coeff Bal Eqn Mole Molar Mass Mass Example 2 • The Haber Process involves reacting gaseous nitrogen and gaseous hydrogen to form ammonia. Determine the mass in grams of hydrogen gas required to form 1.00 x 103 g ammonia. Your Turn 2 • If you react 52.9 g of potassium chlorate (KClO3) with excess phosphorus
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Unlike the common law‚ which has a set boundary of rules and regulations‚ equity does not have a concrete structure due to its complex historical background[1]. Trust‚ governed by the laws of equity‚ is a unique creation of common law and is often dealt with challenging and versatile series of events. This problem involves complex areas from topics of formalities‚ constitution of trusts‚ and covenants to settle. In this essay‚ I will fully concentrate on whether each section of the trust is enforceable
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Conflict Is Not Only A Positive Force‚ But is Absolutely Necessary For Effective Group Performance Diana Campbell Portmore Community College Ms. S. Robinson HRMT4801 November 8‚ 2013 Table of Contents What is Conflict 1 Types of Conflict 2 Causes of Group Conflict 2 Advantages of Functional Conflict 3 Example of A Positive Conflict………………..………………………………………… 4 Solutions to Group Conflict…………………………………………………………… 4 Conclusion………………………………………………………………………………. 5 Reference ………………………………………………………………………………
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INTODUCTORY PLANT PATHOLOGY C123P1 Isolation & Study of Sclerotinia (Monilinia) Fructigena Extraction of Polygalacturonase(PG) enzyme Assay Sclerotinia (Monilinia) Fructigena • 10g of infected tissue was taken and ground in a mortar and pestle with 100Mm PH5 citrate buffer then filtered through 4 layers of muslin. • Half of this mixture was boiled at 50°C for 10 minutes and the other half was left at room temperature. • The above steps were repeated with a sample with healthy
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